Chemistry
What is the morality of a solution prepared by dissolving 10.60g of sodium trioxocarbonate (v) in enough distilled water to obtain 250.0 ml of a solution?November 21, 2016

Physics
Steve, if you can, look at the answer given to me by Chegg. It is much more explanatory how 100 comes from than from what you wrote and just told me? 100 is not in the initial problem, so how am I to assume 100 is part of it? The only number given to me is 1%.November 7, 2016

Physics
A certain number of identical resistors are connected in series and their total resistance is measured. When the resistors are disconnected and re-connected in parallel, their total resistance drops to one-percent of the value measured when they were connected in series. How ...November 7, 2016

math
two strips of fabric measure 14 2/3 inches and 20 7/8 inches in length. to form one length, the strips are sew together using 3/8 inch from each strip to make the seam. what is the final length of the fabric after the two strips are sewn together.October 20, 2016

Math
How many times does a palindromic number appear on a 12 hour digital clock between 12 midnight and 12 noon?October 18, 2016

Chemistry
The atomic mass of CU 63 is 62.9296 amu with a natural abudance of 0.692. The average mass of copper is 63.546amu.What is the mass of copper's other isotope?October 9, 2016

Statistics
Bill,mary,and Joe belong to a club of nineteen people. A committee of twelve is to be selected at random from the membership. How many different arrangements are possible? How many of these committees will contain Bill,Mary, and Joe at the same time?September 29, 2016

Statistics
Bill, Mary, and Joe belong to a club of nineteen people. A committee of twelve is to be selected at random from the membership. How many different arrangements are possible. How many of these committees will contain Bill, Mary and Joe at the same time?September 29, 2016

Statistics
Two committees, one with six and one with seven people, are to be selected from a group of eighteen people, with no one person serving on both committees at the same time. In how many ways can this be done?September 29, 2016

Science
A 0.5kg mass connected to a light spring of constant 20N/M occilates on a frictionless track. Calculate the total energy of the systemSeptember 23, 2016

Math
3. The population of Columbus, Ohio, in 2014 was about 823,000. The population of the United States was about 319 million in 2014. (a) Write each population in scientific notation. (b) About how many times larger was the population of the United States than the population of ...September 20, 2016

Chemistry
What volume of 1.0 M NaOH must be added to 1.5 L of 1.20 M CH3COOH (ka=1.8x10^-5) to make the solution a buffer for pH 4.50? I do not understand how to determine the mols of NaOH. I tried to use the equation where: [H3O+] = ka (nHA/nA-) but it is not giving me the correct ...April 10, 2016

math
I need help making this question into a equation? A cable television company charges $15 plus $5 each for extra services and now write an equation to show how much a person would pay for television if they had x number of extra services?April 5, 2016

chemistry
A 0.109g sample of a pure gaseous compound occupies 112ml at 100degrees and 750torr: what is the molecular weight of the compound. ANS=(30.2g,mol). Please I need the solutionMarch 21, 2016

Physics
An airplane is heading 20degree north flying at 200km/hr relative to the air. Simultaneously the wind carries the plane 10degree, east of south at the speed of 60km/hr. (a) find the velocity of the plane relative to the ground. (b) find the component (east and south) of the ...March 8, 2016

Physics
Find the vector cross product of two vectors C=2i-j and D=i+2j-3k. What is the angle between the vectorsMarch 8, 2016

Physics
Find the magnitude of the dot product of the two vectors B=6i+j+2k, D=-1+3j. What is the angle between B and DMarch 8, 2016

Physics
Consider two vectors one of magnitude 3 and the other 4 unit, which of the following is not correct? We can combine these vectors to yield a resultant of. A.7 B.5 C.1 D.0March 8, 2016

Thermodynamic
One mole of CO2 is to be compressed adiabatically from 1 bar and 25 C. Because of irreversibilities and poor design of the compressor the compressor work required is found to be 25 %greater than that for a well-designed (reversible) compressor. Compute the outlet temperature ...March 8, 2016

Physics
Am I to substitute it this way 2[5(sin2)]/9.8.? Or will I make use of tan instead, since tan=2March 7, 2016

Physics
A body is projected such that the horizontal range is twice the maximum height of projection. Find the angle of projection; and the time of flight if the velocity of projection is 5m/sMarch 7, 2016

Physics
What is the total time of flight of an object projected vertically upwards with a speed of 30m/s? (g=10m/s^2March 7, 2016

physics
the surface tension Y, of liquid depends on the density,P, acceleration of gravity,g, and the height, h. use the method of dimension to derive the actual relationship between these quantitiesMarch 7, 2016

physics
a sphere of radius r moving with velocity v through a fluid experiences a retarding force f given by F=6r^yv^zn^x where n is the viscosity of the liquid. use the method of dimensions to find the values of x,y,and z.March 7, 2016

Physics
A brass cube 2cm on each edge is held in the jaw of a wire with a force 1600N. By aw much is the cube compressed. (Y for brass is 9.1×10^10pa)March 6, 2016

physics
The vertical and horizontal component of the initial velocity of a projectile are 36m/s and 64m/s. Find the initial velocity and angle inclinationMarch 6, 2016

maths
A contractor supplied some items to a school. The contractor's bill is shown below. If each amount includes 5% VAT calculate how much the government receives as VAT. Electrical fittings = #52 500.March 5, 2016

maths
A rectangle of length y m and breadth 4 m less than the length. What is the perimeter??March 4, 2016

math-finance
suppose you are offered two identical jobs: one paying a starting salary of $40,000 with yearly raises of $2,000 and one paying a starting salary of $36,000 with yearly raises of $25,000. Which job will pay more over a 10 year period? I=PRT = 40,000 x 0.05 x 10 = 20,000. S = ...February 26, 2016

physcis
a girl throws a ball vertically upward with a speed of 20 ft/sec from the roof of a building 60 ft high.(a)how long will it take the ball to reach the ground? (b)what will its speed be when it strikes the ground?February 21, 2016

math
jane gets 1/2 of a gold star each time she helps her teacher clean up the classroom after class. How many times would Jane need to help her teacher to earn 3 whole gold stars? Draw fraction. Strips to help.February 5, 2016

math
Air is pumped into a spherical balloon at the rate of 20cm^3/s^-1.find the rate of change of radius of the balloon when the radius is 6cmNovember 25, 2015

probability theory
3 students; A, B and C, are in a swimming race. A and B have the same probability of winning and each is twice as likely to win as C. Find the probability that B or C wins the swimming race. 3) Given three boxes as follows: Box A contains 3 red, 2 white and 2 blue balls. Box B...November 20, 2015

English
if you want to say he left the stage then your answer should be "He disappeared from stage"..... else both are correct with different meanings..November 20, 2015

chem
How would your experimental formula of magnesium chloride MgClx have been affected if your product was not dried completely before weighing it? Would x be too high or two low?October 28, 2015

Biology
Some people experience heartburn when eating fatty, greasy foods (similar to the effect that is felt when eating acidic foods). Why would this occur with fats? I know fatty acids are made of carboxylic acid and if you have too much, would it make sense to say that ...October 27, 2015

PHYSICS
An automobile accident causes both the driver and passenger front airbags to deploy. a. If the vehicle travelled at a speed of 88.6 km/h is now at rest, find the change in momentum for both the 68.4 kg adult driver and the 34.2 kg child passenger. b. The adult took 0.564 s and...October 24, 2015

Science
The solubility of a compound in water is 6.8g/100ml at 25°C.. Calculate the amount of water required to crystallize 10g of the compound. If the pure compound is collected at 25°C what is the maximum possible yield percent.September 21, 2015

Math
A toy company manufactures miniature cars. They sell miniature sports cars in a box. They sell 12 miniature trucks in a box. Mrs. Murphy wants to buy an equal number of sports cars and trucks for the Boys and Girls Club. What is the least number of miniature sports cars she ...August 16, 2015

maths
A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn.July 23, 2015

math
A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn. My work: (a) (5/14)^2(6/14)(3/14...July 22, 2015

physics
consider a vertical piston system. the piston has a 50g mass and a given radius of 3mm. what amount of pressure does the piston exert? ( use g==9.8 m/s^2 )June 2, 2015

math
what is the surface area of a cube with sides measuring 2 inches?May 14, 2015

Managerial Economics
1. A principal-agent problems occur when managerial decisions are not consistent with the firm's shareholders' interests. T 2. A firm making more than a normal profit may still be experiencing an economic loss. T 3. An inferior good is a good whose demand decreases as ...May 13, 2015

Chemistry
If 84.1 g of sodium hydroxide are reacted with 51.0 g of aluminum in the following equation: 2NaOH + 2Al + 2H2O --> 2NaAlO2 + 3H2 a) what mass of excess reactant remains? b) what mass of water would react?March 28, 2015

Physics
A baseball player leads off the game and hits a long home run. The ball leaves the bat at an angle of 30.0o from the horizontal with a velocity of 40.0 m/s. How far will it travel in the air? Working out pleaseMarch 17, 2015

Math
The winner of a raffle will receive 3/4 of the 530.40 raised from raffle ticket salesJanuary 22, 2015

Math
Delia has 493 stamps in her stamp collection. She can put 16 stamps on each page of an album. How many pages can she fill completely?January 21, 2015

GRANTHAM
Find the present value of the ordinary annuity. Please round the answer to the nearest cent.$2,000 per semiannual period for 7 yr at 12%/year compounded semiannuallyDecember 30, 2014

Math
I can't. This is how my math teacher put in the question. Its confusing, right? Its just messed up. I was just hoping if someone can plug in the fraction. If I saw how it looks when its all plugged in I might get it.December 18, 2014

Math
The denominator of a fraction is one more then the numerator. If 2 were added to both the numerator and denominator, the new fraction equals 4/5. Find the original fraction.December 18, 2014

physics
A 75-g piece of aluminum at 89 °C is dropped in 1.0 L of water at 1.3 101 °C, which is in an insulated beaker. Assuming that there is negligible heat loss to the surroundings, determine the equilibrium temperature of the systemDecember 8, 2014

math
Gina's art teacher mixes 9 pints of yellow paint with 6 pints of blue paint. Did Gina use the same ratio of yellow paint to blue paint instructed by her teacher.December 7, 2014

math
taryn and alastair both mow lawns. Each charges a flat fee to mow a lawn. The table shows the number of lawns in the past week, the time spent mowing lawns and the money earned. Taryn mowed 9 lawns. She spent 7.5 hrs mowing lawns. Taryn earned $112.50 Alastair mowed 7 lawns. ...December 3, 2014